On-Chip Multiplexed Multiple Entanglement Sources in a Single Silicon Nanowire

The silicon-on-chip photonic circuit is a very promising platform for scalable quantum-information technology for its low loss, small footprint, and its compatibility with CMOS as well as telecom techniques. Multiplexed multiple entanglement sources, including energy-time, time-bin, and polarization-entangled sources based on 1-cm-length single silicon nanowire, are all compatible with the (100-GHz) dense-wave-division- multiplexing system. Different methods, such as two-photon interference as well as Bell-inequality and quantum-state tomography, are used to characterize the quality of these entangled sources. Multiple entanglements are generated over more than five channel pairs with high raw (net) visibilities of around 97% (100%). The emission spectral brightness of these entangled sources reaches 4.2 x 10(5)/(s nmmW). The quality of the photon pair generated in the continuous and pulse-pump regimes are compared. The high quality of these multiple entanglement sources makes them very promising for use in minimized quantumcommunication and computation systems.